download projektor then build instead of exiting

latex/presentation/Makefile

@@ -16,13 +16,18 @@ $(PDF): %.pdf: %.tex
 ifneq (,$(wildcard $(PKG)))
 	@$(TEXMK) $<
 else
-	@echo "Can't proceed, $(PKG) missing."
+	@$(MAKE) updatepackage
+	@$(MAKE) $@
 endif
 
 EXTS = aux fdb_latexmk fls log nav out snm synctex.gz toc vrb
 clean:
 	$(RM) $(PDF) _minted-$(NAME)/ $(foreach ext,$(EXTS),$(NAME).$(ext))
 
+full-clean:
+	$(RM) $(PKG)
+	@$(MAKE) clean
+
 updatepackage:
 	@$(WGET) https://git.mylloon.fr/Anri/projektor/raw/branch/main/projektor.sty \
 		-O $(PKG)